September 20, 2026

CVE Watchtower

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CVE-2026-90776NVD

Description

Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.
Severity Level
HIGH (7.5)
Published Date
13/09/2026
Last Modified
16/09/2026
Exploitation Status
????
EPSS Score
0.48% (percentile 40.5%)

CVSS Base Metrics

CVSS v3 (3.1)
HIGH 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4 (4.0)
HIGH 8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Weaknesses (CWE)

CWE-407 - Inefficient Algorithmic Complexity

Affected & Patched Versions

ProductAffected VersionsPatched Version
nodemailer nodemailer9.1.0 - < 10.0.510.0.5
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💬Webhooks — Slack & Teams integration.
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📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
⚙️Custom EPSS — Filter noise, focus on risk.
💬Webhooks — Slack & Teams integration.
🚫Ad-Free — Uninterrupted experience.

References